AG Fire Sprinkler Model F3QR, are intended for use in dry and preaction systems to protect areas subjected to freezing temperatures and unheated portions inside and outside buildings. The Model DH56 is a horizontal sidewall dry sprinkler intended for installation in light hazard occupancies in accordance with NFPA 13. These sprinklers are designed to provide fire protection in long and narrow spaces such as hallways, corridors, decks and rooms up to 28 feet (8,5m) wide and 10 feet (3m) long.